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Note 7 - Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    June 30,   December 31,
    2019   2018
    (Unaudited)   (Audited)
Inventories consist of the following:                
Raw materials   $
416,629
    $
467,842
 
Work in process    
45,177
     
30,057
 
Finished products    
838,985
     
984,252
 
Total Inventories
  $
1,300,791
    $
1,482,151